CRNDE enhances neuropathic pain via modulating miR‐136/IL6R axis in CCI rat models

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Abstract
Neuropathic pain has been reported as a type of chronic pain due to the primary dysfunction of the somatosensory nervous system. It is the most serious types of chronic pain, which can lead to a significant public health burden. But, the understanding of the cellular and molecular pathogenesis of neuropathic pain is barely complete. Long noncoding RNAs (lncRNAs) have recently been regarded as modulators of neuronal functions. Growing studies have indicated lncRNAs can exert crucial roles in the development of neuropathic pain. Therefore, our present study focused on the potential role of the lncRNA Colorectal Neoplasia Differentially Expressed (CRNDE) in neuropathic pain progression. Firstly, a chronic constrictive injury (CCI) rat model was built. CRNDE was obviously increased in CCI rats. Interestingly, overexpression of CRNDE enhanced neuropathic pain behaviors. Neuroinflammation was induced by CRNDE and as demonstrated, interleukin‐10 (IL‐10), IL‐1, IL‐6, and tumor necrosis factor‐α (TNF‐α) protein levels in CCI rats were activated by LV‐CRNDE. For another, miR‐136 was obviously reduced in CCI rats. Previously, it is indicated that miR‐136 participates in the spinal cord injury via an inflammation in a rat model. Here, firstly, we verified miR‐136 could serve as CRNDE target. Loss of miR‐136 triggered neuropathic pain remarkably via the neuroinflammation activation. Additionally, IL6R was indicated as a target of miR‐136 and miR‐136 regulated its expression. Subsequently, we confirmed that CRNDE could induce interleukin 6 receptor (IL6R) expression positively. Overall, it was implied that CRNDE promoted neuropathic pain progression via modulating miR‐136/IL6R axis in CCI rat models.

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